Geert Koster, born Groningen, the Netherlands in 1961, had his degree at the Academy of Art Minerva in Groningen  in 1984 and at the Domus Academy in Milano  in 1985.

Since 1985 he works in Italy, collaborates with Michele De Lucchi, for which he was responsable of exhibition, corporate and interior design for companies including Museum of Groningen, the exhibition "Citizen Office" for Vitra, ENEL produzione, Olivetti, Telecom Italia, Gruppo Charme,  Artemide and Mandarina Duck.

In 1989 he opens his studio in Milano, STUDIO KOSTER, working in the field of interiors, exhibitions, furniture, product and industrial design. His activities include work for companies like Abet laminati, Olivetti Synthesis, Cappelini International, Lema spa, Montis, Sintesi, Ing.Castaldi illuminazione, Belux  AG, Hidden and Metalarte.